<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://lib.baomitu.com/jquery/3.4.1/jquery.min.js"></script>

    <style>
        body{
        width: 100%;
            height: 100%;
            background-color: red;
        }
    </style>
</head>
<body>
<script>
   $(function () {

   })
</script>
</body>
</html>